Baidu Encyclopedia: Paint Mist Purification Machine

Introduction to the paint mist purifier, commonly known as spray booth. The process purpose of this equipment is to purify the overspray mist during the painting process as much as possible. The significance of the paint mist purifier is to achieve internal and external environmental protection. It protects the physical and mental health of the operating employees and reduces public nuisances. The paint mist purifier is one of the essential equipment in the spray coating production line process. The paint mist purifier uses paint mist filtration material as the core component. The spray exhaust gas passes through multiple layers of gradually denser flame-retardant glass fiber material. The paint mist particles are intercepted, collided with, and absorbed by the material, and gradually weathered into powder to achieve the purpose of purifying the paint mist.

Performance features:

1. No water required, environmentally friendly and energy-saving;

2. High efficiency in paint mist purification, with a purification efficiency as high as 90-99%;

3. Low equipment operation resistance, low operation energy consumption;

4. Simple equipment structure, convenient maintenance and repair;

5. High purification efficiency, large dust holding capacity, flame retardant, low resistance, long service life for paint mist filtration materials.

Scope of application: This equipment can be widely used for the purification treatment of low concentration organic exhaust gas produced in industries such as petroleum, chemical, rubber, paint, coating, furniture, home appliances, printing, etc. The types of organic substances that can be treated include benzene, ketone, ester, alcohol, ether, and alkane.

Working principle: This equipment consists of an oil mist absorption section, gas-liquid separation section, centrifugal separation section, high-efficiency filtration section, low-temperature plasma purification section, and activated carbon adsorption deodorization section. When the oil mist purification unit is in operation, the paint mist first enters the atomization absorption section. This section uses waste motor oil atomization to absorb the paint mist molecules, reducing the concentration of benzene-containing exhaust gas; the absorbed paint mist then enters the gas-liquid separation section, where the oil molecules and paint mist molecules in the paint mist are separated through inertial collision and turbulent collision in the gas-liquid separator. Then, under the high-speed rotation and centrifugal force of the fan impeller, the flow velocity and direction of the paint mist are continuously changed, causing the flowing paint mist to collide, compress, and coalesce on the impeller. The coagulated paint mist forms tiny particles, which are thrown onto the inner wall of the box by the centrifugal force and drained through the leaky liquid pipe. After centrifugal separation, most of the paint mist molecular particles have been removed, and the escaped molecules enter the ultra-fine sponge filtration section again, using the large specific surface area of the ultra-fine sponge to strongly retain oil and paint mist molecules. After being purified by the first four levels, the paint mist molecules and oil mist molecules have basically removed their particle molecules, then entering the plasma purification zone and deodorization zone, where micron and submicron level molecules are degraded, sterilized, disinfected, and deodorized before completely clean gas is emitted.

Development status: Currently, coatings used in spraying still mainly consist of solvents. Organic solvents—benzene, toluene, xylene (collectively referred to as 'three benzenes')—in the paint film surface and paint mist directly volatilize into the workshop air. At the same time, fine paint mist droplets form dust after solvent evaporation, also dispersing in the workshop air. Three benzenes belong to highly toxic solvents. When workers inhale them through their respiratory tracts during operations, they can cause acute and chronic poisoning, mainly damaging the central nervous system and hematopoietic system. Short-term inhalation of high concentrations (1500 mg/m³) of benzene vapor can lead to aplastic anemia; frequent inhalation of low concentrations of benzene vapor can cause nausea, vomiting, confusion, and other neurological symptoms, and in some cases, neurosis syndrome. Toluene's toxicity to the central nervous system is stronger than benzene, but its effect on the hematopoietic system is less than benzene. According to reports, long-term exposure to a benzene concentration of 188 µg/m³ can result in obvious subjective symptoms. The chronic harm of toluene is less than benzene, but at concentrations of 43-1300 mg/m³, poisoning symptoms may appear. When three benzenes are mixed together, they can also irritate the eyes and nasal mucosa, and neurological symptoms become more severe. In summary, the hazards of paint mist to workers cannot be ignored. Under high pressure, paint is atomized into fine particles, but during spray gun spraying, not all the paint reaches the spray surface. These paint particles form paint mist with the airflow. To improve the working environment of workers in the workshop and meet environmental protection requirements, it is necessary to treat the paint mist for emission up to standard.

Scope of application: This equipment can be widely used for the purification treatment of low-concentration organic exhaust gas produced in industries such as petroleum, chemical, rubber, paint, coating, furniture, home appliances, printing, etc. The types of organic substances that can be treated include benzene, ketone, ester, alcohol, ether, and alkane.

Working principle: This equipment consists of an oil mist absorption section, gas-liquid separation section, centrifugal separation section, high-efficiency filtration section, low-temperature plasma purification section, and activated carbon adsorption deodorization section. When the oil mist purification unit is in operation, the paint mist first enters the atomization absorption section. This section uses waste motor oil atomization to absorb the paint mist molecules, reducing the concentration of benzene-containing exhaust gas; the absorbed paint mist then enters the gas-liquid separation section, where the oil molecules and paint mist molecules in the paint mist are separated through inertial collision and turbulent collision in the gas-liquid separator. Then, under the high-speed rotation and centrifugal force of the fan impeller, the flow velocity and direction of the paint mist are continuously changed, causing the flowing paint mist to collide, compress, and coalesce on the impeller. The coagulated paint mist forms tiny particles, which are thrown onto the inner wall of the box by the centrifugal force and drained through the leaky liquid pipe. After centrifugal separation, most of the paint mist molecular particles have been removed, and the escaped molecules enter the ultra-fine sponge filtration section again, using the large specific surface area of the ultra-fine sponge to strongly retain oil and paint mist molecules. After being purified by the first four levels, the paint mist molecules and oil mist molecules have basically removed their particle molecules, then entering the plasma purification zone and deodorization zone, where micron and submicron level molecules are degraded, sterilized, disinfected, and deodorized before completely clean gas is emitted.